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/* pbmclean.c - pixel cleaning. Remove pixel if less than n connected
* identical neighbours, n=1 default.
* AJCD 20/9/90
*/
#include <stdio.h>
#include "pbm.h"
/* prototypes */
void nextrow ARGS((FILE *ifd, int row));
#define PBM_INVERT(p) ((p) == PBM_WHITE ? PBM_BLACK : PBM_WHITE)
/* input bitmap size and storage */
int rows, columns, format ;
bit *inrow[3] ;
#define thisrow (1)
/* compass directions from west clockwise */
int xd[] = { -1, -1, 0, 1, 1, 1, 0, -1 } ;
int yd[] = { 0, -1, -1, -1, 0, 1, 1, 1 } ;
/* get a new row
*/
void nextrow(ifd, row)
FILE *ifd;
int row;
{
bit *shuffle = inrow[0] ;
inrow[0] = inrow[1];
inrow[1] = inrow[2];
inrow[2] = shuffle ;
if (row < rows) {
if (shuffle == NULL)
inrow[2] = shuffle = pbm_allocrow(columns);
pbm_readpbmrow(ifd, inrow[2], columns, format) ;
} else inrow[2] = NULL; /* discard storage */
}
int
main(argc, argv)
int argc;
char *argv[];
{
FILE *ifd;
register bit *outrow;
register int row, col, i;
int connect ;
pbm_init( &argc, argv );
if (argc > 3)
pm_usage("[-connect] [pbmfile]");
if (argv[1][0] == '-') {
connect = atoi(argv[1]+1);
argv++; argc--;
}
else connect = 1;
if (argc == 2)
ifd = pm_openr(argv[1]);
else
ifd = stdin ;
inrow[0] = inrow[1] = inrow[2] = NULL;
pbm_readpbminit(ifd, &columns, &rows, &format) ;
outrow = pbm_allocrow(columns) ;
pbm_writepbminit(stdout, columns, rows, 0) ;
nextrow(ifd, 0);
for (row = 0; row < rows; row++) {
nextrow(ifd, row+1);
for (col = 0; col < columns; col++) {
int point = inrow[thisrow][col];
int joined = 0 ;
for (i = 0; i < 8; i++) {
int x = col + xd[i] ;
int y = thisrow + yd[i] ;
if (x < 0 || x >= columns) {
if (point == PBM_WHITE) joined++;
}
else if (inrow[y] && inrow[y][x] == point) joined++ ;
}
outrow[col] = (joined < connect) ? PBM_INVERT(point) : point;
}
pbm_writepbmrow(stdout, outrow, columns, 0) ;
}
pm_close(ifd);
exit(0);
}
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.